﻿using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;

namespace Tank90
{
    // 数据访问抽象基础类
    public abstract class DbHelperSQL
    {
        //数据库连接字符串(web.config来配置)
        public static string connectionString = "Data Source=.;Initial Catalog=Tank;Integrated Security=true";

        #region  执行简单SQL语句

        /// <summary>
        ///     执行SQL语句，返回影响的记录数
        /// </summary>
        /// <param name="SQLString">SQL语句</param>
        /// <returns>影响的记录数</returns>
        public static int ExecuteSql(string SQLString)
        {
            using (var connection = new SqlConnection(connectionString))
            {
                using (var cmd = new SqlCommand(SQLString, connection))
                {
                    try
                    {
                        connection.Open();
                        int rows = cmd.ExecuteNonQuery();
                        return rows;
                    }
                    catch (SqlException e)
                    {
                        connection.Close();
                        throw e;
                            //leisi yu zheyang de ,keyijiang yichang pao gei shang yi ceng.shang  yi ceng zai yong try{}catch(){}finally{} bu huo bing chuli.
                    }
                }
            }
        }

        public static int ExecuteSqlByTime(string SQLString, int Times)
        {
            using (var connection = new SqlConnection(connectionString))
            {
                using (var cmd = new SqlCommand(SQLString, connection))
                {
                    try
                    {
                        connection.Open();
                        cmd.CommandTimeout = Times;
                        int rows = cmd.ExecuteNonQuery();
                        return rows;
                    }
                    catch (SqlException e)
                    {
                        connection.Close();
                        throw e;
                    }
                }
            }
        }

        /// <summary>
        ///     执行多条SQL语句，实现数据库事务。
        /// </summary>
        /// <param name="SQLStringList">多条SQL语句</param>
        public static int ExecuteSqlTran(List<String> SQLStringList)
        {
            using (var conn = new SqlConnection(connectionString))
            {
                conn.Open();
                var cmd = new SqlCommand();
                cmd.Connection = conn;
                SqlTransaction tx = conn.BeginTransaction();
                cmd.Transaction = tx;
                try
                {
                    int count = 0;
                    for (int n = 0; n < SQLStringList.Count; n++)
                    {
                        string strsql = SQLStringList[n];
                        if (strsql.Trim().Length > 1)
                        {
                            cmd.CommandText = strsql;
                            count += cmd.ExecuteNonQuery();
                        }
                    }
                    tx.Commit();
                    return count;
                }
                catch
                {
                    tx.Rollback();
                    return 0;
                }
            }
        }

        /// <summary>
        ///     执行带一个存储过程参数的的SQL语句。
        /// </summary>
        /// <param name="SQLString">SQL语句</param>
        /// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>
        /// <returns>影响的记录数</returns>
        public static int ExecuteSql(string SQLString, string content)
        {
            using (var connection = new SqlConnection(connectionString))
            {
                var cmd = new SqlCommand(SQLString, connection);
                var myParameter = new SqlParameter("@content", SqlDbType.NText);
                myParameter.Value = content;
                cmd.Parameters.Add(myParameter);
                try
                {
                    connection.Open();
                    int rows = cmd.ExecuteNonQuery();
                    return rows;
                }
                catch (SqlException e)
                {
                    throw e;
                }
                finally
                {
                    cmd.Dispose();
                    connection.Close();
                }
            }
        }

        /// <summary>
        ///     执行带一个存储过程参数的的SQL语句。
        /// </summary>
        /// <param name="SQLString">SQL语句</param>
        /// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>
        /// <returns>影响的记录数</returns>
        public static object ExecuteSqlGet(string SQLString, string content)
        {
            using (var connection = new SqlConnection(connectionString))
            {
                var cmd = new SqlCommand(SQLString, connection);
                var myParameter = new SqlParameter("@content", SqlDbType.NText);
                myParameter.Value = content;
                cmd.Parameters.Add(myParameter);
                try
                {
                    connection.Open();
                    object obj = cmd.ExecuteScalar();
                    if ((Equals(obj, null)) || (Equals(obj, DBNull.Value)))
                    {
                        return null;
                    }
                    else
                    {
                        return obj;
                    }
                }
                catch (SqlException e)
                {
                    throw e;
                }
                finally
                {
                    cmd.Dispose();
                    connection.Close();
                }
            }
        }

        /// <summary>
        ///     向数据库里插入图像格式的字段(和上面情况类似的另一种实例)
        /// </summary>
        /// <param name="strSQL">SQL语句</param>
        /// <param name="fs">图像字节,数据库的字段类型为image的情况</param>
        /// <returns>影响的记录数</returns>
        public static int ExecuteSqlInsertImg(string strSQL, byte[] fs)
        {
            using (var connection = new SqlConnection(connectionString))
            {
                var cmd = new SqlCommand(strSQL, connection);
                var myParameter = new SqlParameter("@fs", SqlDbType.Image);
                myParameter.Value = fs;
                cmd.Parameters.Add(myParameter);
                try
                {
                    connection.Open();
                    int rows = cmd.ExecuteNonQuery();
                    return rows;
                }
                catch (SqlException e)
                {
                    throw e;
                }
                finally
                {
                    cmd.Dispose();
                    connection.Close();
                }
            }
        }

        /// <summary>
        ///     执行一条计算查询结果语句，返回查询结果（object）。
        /// </summary>
        /// <param name="SQLString">计算查询结果语句</param>
        /// <returns>查询结果（object）</returns>
        public static int GetSingle(string SQLString)
        {
            using (var connection = new SqlConnection(connectionString))
            {
                using (var cmd = new SqlCommand(SQLString, connection))
                {
                    try
                    {
                        connection.Open();
                        int rows = int.Parse(cmd.ExecuteScalar().ToString());
                        return rows;
                    }
                    catch (SqlException e)
                    {
                        connection.Close();
                        throw e;
                    }
                }
            }
        }

        public static object GetSingle(string SQLString, int Times)
        {
            using (var connection = new SqlConnection(connectionString))
            {
                using (var cmd = new SqlCommand(SQLString, connection))
                {
                    try
                    {
                        connection.Open();
                        cmd.CommandTimeout = Times;
                        object obj = cmd.ExecuteScalar();
                        if ((Equals(obj, null)) || (Equals(obj, DBNull.Value)))
                        {
                            return null;
                        }
                        return obj;
                    }
                    catch (SqlException e)
                    {
                        connection.Close();
                        throw e;
                    }
                }
            }
        }

        /// <summary>
        ///     执行查询语句，返回DataSet
        /// </summary>
        /// <param name="SQLString">查询语句</param>
        /// <returns>DataSet</returns>
        public static DataSet Query(string SQLString)
        {
            var ds = new DataSet();
            try
            {
                using (var connection = new SqlConnection(connectionString))
                {
                    connection.Open();
                    var command = new SqlDataAdapter(SQLString, connection);
                    command.Fill(ds, "ds");
                }
            }
            catch
            {
                ds = null;
            }
            return ds;
        }

        //public static DataSet IQuery(string SQLString)
        //{
        //    using (SqlConnection connection = new SqlConnection(iconnectionString))
        //    {
        //        DataSet ds = new DataSet();
        //        try
        //        {
        //            connection.Open();
        //            SqlDataAdapter command = new SqlDataAdapter(SQLString, connection);
        //            command.Fill(ds, "ds");
        //        }
        //        catch (System.Data.SqlClient.SqlException ex)
        //        {
        //            throw new Exception(ex.Message);
        //            throw new Exception(SQLString);
        //        }
        //        return ds;
        //    }
        //}

        public static DataSet Query(string SQLString, int Times)
        {
            using (var connection = new SqlConnection(connectionString))
            {
                var ds = new DataSet();
                try
                {
                    connection.Open();
                    var command = new SqlDataAdapter(SQLString, connection);
                    command.SelectCommand.CommandTimeout = Times;
                    command.Fill(ds, "ds");
                }
                catch (SqlException ex)
                {
                    throw new Exception(ex.Message);
                }
                return ds;
            }
        }

        #endregion

        #region 执行带参数的SQL语句

        /// <summary>
        ///     执行SQL语句，返回影响的记录数
        /// </summary>
        /// <param name="SQLString">SQL语句</param>
        /// <returns>影响的记录数</returns>
        public static int ExecuteSql(string SQLString, params SqlParameter[] cmdParms)
        {
            using (var connection = new SqlConnection(connectionString))
            {
                using (var cmd = new SqlCommand())
                {
                    try
                    {
                        PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                        int rows = cmd.ExecuteNonQuery();
                        cmd.Parameters.Clear();
                        return rows;
                    }
                    catch (SqlException e)
                    {
                        throw e;
                    }
                }
            }
        }


        /// <summary>
        ///     执行多条SQL语句，实现数据库事务。
        /// </summary>
        /// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的SqlParameter[]）</param>
        public static Boolean ExecuteSqlTran(List<DictionaryEntry> SQLStringList)
        {
            using (var conn = new SqlConnection(connectionString))
            {
                conn.Open();
                using (SqlTransaction trans = conn.BeginTransaction())
                {
                    var cmd = new SqlCommand();
                    try
                    {
                        //循环
                        foreach (DictionaryEntry myDE in SQLStringList)
                        {
                            string cmdText = myDE.Key.ToString();
                            SqlParameter[] Parms = null;
                            if (myDE.Value != null && myDE.Value.ToString() != "")
                            {
                                Parms = (SqlParameter[]) myDE.Value;
                            }
                            PrepareCommand(cmd, conn, trans, cmdText, Parms);
                            int val = cmd.ExecuteNonQuery();
                            cmd.Parameters.Clear();
                        }
                        trans.Commit();
                        return true;
                    }
                    catch (Exception)
                    {
                        trans.Rollback();
                        return false;
                        throw;
                    }
                }
            }
        }


        /// <summary>
        ///     执行多条SQL语句，实现数据库事务。
        /// </summary>
        /// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的SqlParameter[]）</param>
        public static void ExecuteSqlTranWithIndentity(Hashtable SQLStringList)
        {
            using (var conn = new SqlConnection(connectionString))
            {
                conn.Open();
                using (SqlTransaction trans = conn.BeginTransaction())
                {
                    var cmd = new SqlCommand();
                    try
                    {
                        int indentity = 0;
                        //循环
                        foreach (DictionaryEntry myDE in SQLStringList)
                        {
                            string cmdText = myDE.Key.ToString();
                            var cmdParms = (SqlParameter[]) myDE.Value;
                            foreach (SqlParameter q in cmdParms)
                            {
                                if (q.Direction == ParameterDirection.InputOutput)
                                {
                                    q.Value = indentity;
                                }
                            }
                            PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
                            int val = cmd.ExecuteNonQuery();
                            foreach (SqlParameter q in cmdParms)
                            {
                                if (q.Direction == ParameterDirection.Output)
                                {
                                    indentity = Convert.ToInt32(q.Value);
                                }
                            }
                            cmd.Parameters.Clear();
                        }
                        trans.Commit();
                    }
                    catch
                    {
                        trans.Rollback();
                        throw;
                    }
                }
            }
        }

        /// <summary>
        ///     执行一条计算查询结果语句，返回查询结果（object）。
        /// </summary>
        /// <param name="SQLString">计算查询结果语句</param>
        /// <returns>查询结果（object）</returns>
        public static object GetSingle(string SQLString, params SqlParameter[] cmdParms)
        {
            using (var connection = new SqlConnection(connectionString))
            {
                using (var cmd = new SqlCommand())
                {
                    try
                    {
                        PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                        object obj = cmd.ExecuteScalar();
                        cmd.Parameters.Clear();
                        if ((Equals(obj, null)) || (Equals(obj, DBNull.Value)))
                        {
                            return null;
                        }
                        return obj;
                    }
                    catch (SqlException e)
                    {
                        throw e;
                    }
                }
            }
        }

        /// <summary>
        ///     执行查询语句，返回DataSet
        /// </summary>
        /// <param name="SQLString">查询语句</param>
        /// <returns>DataSet</returns>
        public static DataSet Query(string SQLString, params SqlParameter[] cmdParms)
        {
            using (var connection = new SqlConnection(connectionString))
            {
                var cmd = new SqlCommand();
                PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                using (var da = new SqlDataAdapter(cmd))
                {
                    var ds = new DataSet();
                    try
                    {
                        da.Fill(ds, "ds");
                        cmd.Parameters.Clear();
                    }
                    catch (SqlException ex)
                    {
                        throw new Exception(ex.Message);
                    }
                    return ds;
                }
            }
        }

        #endregion

        #region 存储过程操作

        /// <summary>
        ///     执行存储过程
        /// </summary>
        /// <param name="storedProcName">存储过程名</param>
        /// <param name="parameters">存储过程参数</param>
        /// <returns>DataSet</returns>
        public static DataSet RunProcedure(string storedProcName, IDataParameter[] parameters)
        {
            using (var connection = new SqlConnection(connectionString))
            {
                var dataSet = new DataSet();
                connection.Open();
                var sqlDA = new SqlDataAdapter();
                sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters);
                sqlDA.Fill(dataSet);
                connection.Close();
                return dataSet;
            }
        }


        /// <summary>
        ///     执行存储过程
        /// </summary>
        /// <param name="storedProcName">存储过程名</param>
        /// <param name="parameters">存储过程参数</param>
        /// <param name="tableName">DataSet结果中的表名</param>
        /// <returns>DataSet</returns>
        public static DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName)
        {
            using (var connection = new SqlConnection(connectionString))
            {
                var dataSet = new DataSet();
                connection.Open();
                var sqlDA = new SqlDataAdapter();
                sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters);
                sqlDA.Fill(dataSet, tableName);
                connection.Close();
                return dataSet;
            }
        }

        public static DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName,
            int Times)
        {
            using (var connection = new SqlConnection(connectionString))
            {
                var dataSet = new DataSet();
                connection.Open();
                var sqlDA = new SqlDataAdapter();
                sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters);
                sqlDA.SelectCommand.CommandTimeout = Times;
                sqlDA.Fill(dataSet, tableName);
                connection.Close();
                return dataSet;
            }
        }

        /// <summary>
        ///     构建 SqlCommand 对象(用来返回一个结果集，而不是一个整数值)
        /// </summary>
        /// <param name="connection">数据库连接</param>
        /// <param name="storedProcName">存储过程名</param>
        /// <param name="parameters">存储过程参数</param>
        /// <returns>SqlCommand</returns>
        private static SqlCommand BuildQueryCommand(SqlConnection connection, string storedProcName,
            IDataParameter[] parameters)
        {
            var command = new SqlCommand(storedProcName, connection);
            command.CommandType = CommandType.StoredProcedure;
            foreach (SqlParameter parameter in parameters)
            {
                if (parameter != null)
                {
                    // 检查未分配值的输出参数,将其分配以DBNull.Value.
                    if ((parameter.Direction == ParameterDirection.InputOutput ||
                         parameter.Direction == ParameterDirection.Input) &&
                        (parameter.Value == null))
                    {
                        parameter.Value = DBNull.Value;
                    }
                    command.Parameters.Add(parameter);
                }
            }

            return command;
        }

        /// <summary>
        ///     执行存储过程，返回影响的行数
        /// </summary>
        /// <param name="storedProcName">存储过程名</param>
        /// <param name="parameters">存储过程参数</param>
        /// <param name="rowsAffected">影响的行数</param>
        /// <returns></returns>
        public static int RunProcedure(string storedProcName, IDataParameter[] parameters, out int rowsAffected,
            string outName)
        {
            using (var connection = new SqlConnection(connectionString))
            {
                int result;
                connection.Open();
                try
                {
                    SqlCommand command = BuildIntCommand(connection, storedProcName, parameters);
                    rowsAffected = command.ExecuteNonQuery();
                    result = (int) command.Parameters["" + outName + ""].Value;
                    //Connection.Close();
                    return result;
                }
                catch
                {
                    rowsAffected = 0;
                    return 0;
                }
            }
        }

        /// <summary>
        ///     创建 SqlCommand 对象实例(用来返回一个整数值)
        /// </summary>
        /// <param name="storedProcName">存储过程名</param>
        /// <param name="parameters">存储过程参数</param>
        /// <returns>SqlCommand 对象实例</returns>
        private static SqlCommand BuildIntCommand(SqlConnection connection, string storedProcName,
            IDataParameter[] parameters)
        {
            SqlCommand command = BuildQueryCommand(connection, storedProcName, parameters);
            //command.Parameters.Add(new SqlParameter("ReturnValue",
            //    SqlDbType.Int, 4, ParameterDirection.ReturnValue,
            //    false, 0, 0, string.Empty, DataRowVersion.Default, null));
            return command;
        }

        #endregion

        #region 公用方法

        /// <summary>
        ///     判断是否存在某表的某个字段
        /// </summary>
        /// <param name="tableName">表名称</param>
        /// <param name="columnName">列名称</param>
        /// <returns>是否存在</returns>
        public static bool ColumnExists(string tableName, string columnName)
        {
            string sql = "select count(1) from syscolumns where [id]=object_id('" + tableName + "') and [name]='" +
                         columnName + "'";
            object res = GetSingle(sql);
            if (res == null)
            {
                return false;
            }
            return Convert.ToInt32(res) > 0;
        }

        public static int GetMaxID(string FieldName, string TableName)
        {
            string strsql = "select max(convert(bigint," + FieldName + "))+1 from " + TableName;
            object obj = GetSingle(strsql);
            if (obj == null)
            {
                return 1;
            }
            return int.Parse(obj.ToString());
        }

        /// <summary>
        ///     执行一条计算查询结果语句，返回查询结果（object）。
        /// </summary>
        /// <param name="SQLString">计算查询结果语句</param>
        /// <returns>查询结果（object）</returns>
        public static object GetSingle2(string SQLString)
        {
            using (var connection = new SqlConnection(connectionString))
            {
                using (var cmd = new SqlCommand(SQLString, connection))
                {
                    try
                    {
                        connection.Open();
                        Object res = cmd.ExecuteScalar();
                        return res;
                    }
                    catch (SqlException e)
                    {
                        connection.Close();
                        throw e;
                    }
                }
            }
        }

        public static bool Exists(string strSql)
        {
            object obj = GetSingle(strSql);
            int cmdresult;
            if ((Equals(obj, null)) || (Equals(obj, DBNull.Value)))
            {
                cmdresult = 0;
            }
            else
            {
                cmdresult = int.Parse(obj.ToString());
            }
            if (cmdresult == 0)
            {
                return false;
            }
            return true;
        }

        public static bool Exists(string strSql, params SqlParameter[] cmdParms)
        {
            object obj = GetSingle(strSql, cmdParms);
            int cmdresult;
            if ((Equals(obj, null)) || (Equals(obj, DBNull.Value)))
            {
                cmdresult = 0;
            }
            else
            {
                cmdresult = int.Parse(obj.ToString());
            }
            if (cmdresult == 0)
            {
                return false;
            }
            return true;
        }


        /// <summary>
        ///     表是否存在
        /// </summary>
        /// <param name="TableName"></param>
        /// <returns></returns>
        public static bool TabExists(string TableName)
        {
            string strsql = "select count(*) from sysobjects where id = object_id(N'[" + TableName +
                            "]') and OBJECTPROPERTY(id, N'IsUserTable') = 1";
            object obj = GetSingle(strsql);
            int cmdresult;
            if ((Equals(obj, null)) || (Equals(obj, DBNull.Value)))
            {
                cmdresult = 0;
            }
            else
            {
                cmdresult = int.Parse(obj.ToString());
            }
            if (cmdresult == 0)
            {
                return false;
            }
            return true;
        }

        private static void BuildCommand(string cmdTest, CommandType cmdType, SqlConnection conn, SqlCommand cmd,
            params SqlParameter[] values)
        {
            if (conn != null)
            {
                conn = new SqlConnection(connectionString);
                conn.Open();
            }
            else if (conn.State == ConnectionState.Closed) conn.Open();
            if (cmd == null)
            {
                cmd = new SqlCommand();
            }
            cmd.Connection = conn;
            cmd.CommandText = cmdTest;
            cmd.CommandType = cmdType;
            cmd.CommandTimeout = 300;
            if (values != null)
            {
                cmd.Parameters.AddRange(values);
            }
        }

        public static int ExceCommand(string cmdTest, CommandType cmdType, params SqlParameter[] values)
        {
            int result = -1;
            using (var conn = new SqlConnection(connectionString))
            {
                var cmd = new SqlCommand();
                BuildCommand(cmdTest, cmdType, conn, cmd, values);
                result = cmd.ExecuteNonQuery();
            }
            return result;
        }

        public static SqlDataReader GetReader(string cmdTest, CommandType cmdType, params SqlParameter[] values)
        {
            SqlDataReader dr = null;
            var conn = new SqlConnection(connectionString);
            var cmd = new SqlCommand();
            BuildCommand(cmdTest, cmdType, conn, cmd, values);
            dr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
            return dr;
        }

        public static int ExecuteScalar(string cmdTest, CommandType cmdType, params SqlParameter[] values)
        {
            using (var conn = new SqlConnection(connectionString))
            {
                var cmd = new SqlCommand();
                BuildCommand(cmdTest, cmdType, conn, cmd, values);
                int result = Convert.ToInt32(cmd.ExecuteScalar());
                return result;
            }
        }

        public static DataTable GetSet(string cmdTest, CommandType cmdType, params SqlParameter[] values)
        {
            var ds = new DataSet();
            var conn = new SqlConnection();
            var cmd = new SqlCommand();
            BuildCommand(cmdTest, cmdType, conn, cmd, values);
            var dr = new SqlDataAdapter(cmd);
            dr.Fill(ds);
            return ds.Tables[0];
        }

        public static DataSet GetDataSet(string cmdTest, CommandType cmdType, params SqlParameter[] values)
        {
            var ds = new DataSet();
            var conn = new SqlConnection();
            var cmd = new SqlCommand();
            BuildCommand(cmdTest, cmdType, conn, cmd, values);
            var dr = new SqlDataAdapter(cmd);
            dr.Fill(ds);
            return ds;
        }

        private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, string cmdText,
            SqlParameter[] cmdParms)
        {
            if (conn.State != ConnectionState.Open)
                conn.Open();
            cmd.Connection = conn;
            cmd.CommandText = cmdText;
            if (trans != null)
                cmd.Transaction = trans;
            cmd.CommandType = CommandType.Text; //cmdType;
            if (cmdParms != null)
            {
                foreach (SqlParameter parameter in cmdParms)
                {
                    var parem = (SqlParameter) ((ICloneable) parameter).Clone();

                    if ((parem.Direction == ParameterDirection.InputOutput ||
                         parem.Direction == ParameterDirection.Input) &&
                        (parem.Value == null))
                    {
                        parem.Value = DBNull.Value;
                    }
                    cmd.Parameters.Add(parem);
                }
            }
        }

        #endregion

        //public static string iconnectionString = PubConstant.IConnectionString;
    }
}